Krell KAV-400xi Integrated Amplifier, Customized and Factory Serviced

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This compact yet powerful amplifier went to Krell for a full service where it received a full complement of new caps that address a common failure in this lineup.

We're happy to report it tests super well and sounds like it should, both dynamic and powerful for a such a small convenient package.

The previous owner went to great expense to have the top of the chassis powder coated in gloss black and engraved with the Krell logo. I must say it looks like factory work and is tastefully done.

The integrated does some signs of use so please look over the pictures carefully.

Includes the original working remote, manual, box, plus a Krell receipt showing the restoration work performed.

Review:

https://www.enjoythemusic.com/superioraudio/equipment/0104/krellkav400xi.htm

Specs:
Stereo integrated amplifier

Power Output Per Channel:
200 watts @ 8 Ohms
400 watts @ 4 Ohms

Frequency Response:
20Hz to 20kHz

Signal To Noise Ratio:
99dB (A weighted)

THD:
1kHz <0.04%
20kHz <0.25%

Gain:
38.5dB

Input Sensitivity:
0.644 Vrms

Input impedance:
47k Ohms

Output Impedance:
0.17 Ohms

Inputs And Outputs:
• 1 pair balanced (XLR)
• 3 pairs single ended (RCA) (all with Theater Throughput)
• Tape in/out single-ended
• Pair pre-amplifier output sockets single-ended
• Loudspeakers 4mm binding posts

Other Sockets:
1 RC-5 in/out, RC-5 remote control in

Net Weight:
31.09 lbs.
14.1 kg.

Manual:

Click Here

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - BALANCED XLR Connectors - Better

Kimber Kable - BALANCED XLR Connectors - Best

Kimber Kable - Speaker Cables - Better

Kimber Summit Series Monocle XL Speaker Cables (PAIR) - Best

Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable 

Kimber Kable - Power Cords - Better

Kimber Kable - Power Cords - Best

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.